Details Keep phones, tablets, cameras and electronic devices powered on travels with the massive 20000mAh Mi Power Bank. Its premium lithium-ion polymer batteries supplied by Panasonic/LG have energy densities of up to 728Wh/L. Charge two devices at once with dual USB ports. 5.1V/3.6A Dual USB output Intelligently adjusts power output, compatible with a wide range of devices Enter a whole new level of high-speed of charging with dual USB ports with up to 5.1V/3.6A output. Not only is the output significantly larger than ordinary chargers, 20000mAh Mi Power Bank also automatically adjusts output level based on the connected device. It is compatible with smartphones and tablets from Mi 4, Apple, Samsung, HTC, Google and BlackBerry, as well as a variety of digital cameras and handheld gaming devices. Charging cable included Supports data transfers and charging Mi Power Bank comes with a 318mm long high-quality charging cable. The flat cable design prevents tangles and is sheathed in a soft but  durable, non-toxic TPE material that prevents cable damage. Mirror polishing on the exterior surface allows for stains on the cable to be cleaned  off easily. The cable supports data transfers and can also be used for charging.